Grating



Feb.1s, 1923.

M. LACHMAN.

' GRATING.. FILED Am'zz. 1.920.

Patented Feb. 13, 1923.

UNITED STATES GRATING.

Application filed April 22, 1920.

To all w /L-om t may concern Be it known that I, MAURICE LACHMAN, a citizen of the United States, and a resident of New York, in the county of New York and State of New York, have invented certain new and useful Improvements in (irrat` ings, of which the following is a specification.

y invention relates to gratings and more particularly to metallic gratingsadapted to cover a space or opening provided for light or ventilation purposes. i

The object of the invention is the construction of a vgrating of simplicity of construction and of great strength.

A further object of the invention is the production of a grating so constructed as to have a minimum ot' dirt or dust accumulatmg space.

The invention consists in the improved construction of grating hereinafter more particularly described and then specified in the claims.

In the accompanying drawing:l

n Fig. 1 is a perspective view of my implroved grating showing the parts assemb ed.

Fig. 2 is a perspective view of the grating showing two of the transverse members disassembled.

Referring to the drawing:

My improved rating consists of a plu` rality of intersecting-longitudinal and transverse members, I-,shaped in cross-section, the Webs and upper and lower transverse heads or flanges of the longitudinal members being indicated at l 2 respectively and the Webs and upper and ower transverse heads or flanges of the transverse members at 3 and 4 respectively. As illustrated, the in; ner surfaces 5 and 6 of the heads or flanges 2 and 4 adjacent and meeting theirrespec` tive webs.are inclined thereto so that when the members are assembled to form the finished rating, dust or dirt which would ordinariy accumulate on said inner surfaces 5 and 6 lslides or rolls therefrom.

The upper and lower heads or flanges 2 of the longitudinal members are mitered out as at 7 from the edges of said heads or lianges te the webs l and the upper heads or flanges and lower heads or flanges are slotted alternately as at 8 and 9 (see Fig. 2) respectixf'ely in line with the apex of the mitered portions, said siots extending downwardly or upwardly as the case may be in Serial N0. 375,655.

the webs l of the longitudinal members. Likewise both the upper and lower heads or flanges 4 of the transverse members are mitered out as at 10, said transverse members belng provided with slots l1 in line with the apex of the mitered portions, said slots l1 extending in the webs 3 of said transverse members.

The mitered portions 7 and l0 are of a size and their sides are at an angle which permits them to snugly and tightly vengage each other when the parts are assembled and the slots 8, 9 and 1l are of a width equal to the thickness of the websl and 3 of the longitudinal and transverse members,s'o that thev webs will enter said slots when the parts are Vintermeshed and assembled. Also, the depth' of said slots 8, 9 and l1 is such as to permit the heads or Iianges of the longitudinal and transverse members to lie respectively in the same plane when the members are in assembled position as shown in Fig. l. 7 hen so assembled it will be noted that the heads or flanges of the members at the tops and bot-y toms thereof closely interfit and engage each other as has been explained and provide strengthening members for the grating and act as reinforcements for the webs of the members to prevent them from being bent or twisted or distorted when subjected to strains or pressure applied in any direction. It will also be apparent that the slotting of the longitudinal members alternately at the tops and bottoms as at 8 and 9, throughout their lengths at spaced intervals for the reception of the transverse members, instead of providing all the slots of the members at their tops or at their bottoms, not only acts to distribute the slight loss of strength of said longitudinal members, due to the slotting, evenly therethrough, but acts to enhance the locking feature of the members of the finished grating and thereby the secureness thereof due to the tact that the transverse members are Aintermeshed with the longitudinal members alternately from the 'tops and bottoms ot' said longitudinal members.

While I have shown but two longitudinal and two transverse members in Fig. and three transverse members in Fig. 2 it will be understood that as many members are employed and intermeshed with each other as are required to produce a grating olI the desired size. ln assembling the members, as

many of the longitudinal members as are required are first placed, spaced apart the required distance and in parallelism, on their edges on a suitable table or support an required number of transverse members are' intermeshed/ with thev longitudinal members by pressing or forcing the same downwardly with the Slots ll engaging the webs l and the slots 8 engaging the webs 3 and portions of the upper and lower heads or llanges of both membersV engaging each other l until the `upper and lower flanges respecl transverse members each consisting of a web terminating along each longitudinaltedge in a transverse head or lange, said members intermeshing with each other with the transverse heads or flanges enga-ging each other and lying in the same plane.

3. A grating comprising apluralit-y ot longitudinal members and transverse members intermeshing with each other` and each consisting of a web terminating along each longitudinal edge in a transverse head or flange having'inner inclined surfaces adjacent the web and meeting the same.

4.' A grating comprising longitudinal members andtransverse members each consisting olf a web terminating along each longitudinal edge in an upper and lower transversehead or flange connected with the web by an inclined surface and provided with slots cut in the web and the head or flange, said members intermeshin'g with each other dthe' the mitered i with the slots in one member engaging the web ot'v the other member and the upper and lower heads or flan-ges of both members respectively lying in the same plane.

5,. A grating comprising longitudinal members and transverse members each consisting of a web terminating along its longitudinal edges in an upper and lower transverse head or flange, said longitudinal members being provided with slots cut in their webs and upper heads or flanges and in their webs and lower `heads or flanges and said transverse members being provided with slots cut in their webs and one of their heads or Aflanges, said membersintermeshing with each other with the slots in the longitudinalV members engaging the webs of the transverse members and the slots in the transverse members engaging the webs of the longitudinal members and the upper and lower heads or flanges of'both members respec-v tively engaging each other and lying in the same plane.

6. A grating comprising longitudinal members and transverse members each consisting of a webv terminating along its longituchnal edges in an upper and lower transverse head or llange, said heads or flanges being mitered out from the edges thereof to the webs at spaced intervals and provided with slots cutting through the apex of the mitered out portions and extending into the Webs of the members, said members being intermeshed Vwith each other with the slots in one member engaging the web of the other 'members the mitered out portions interfitting and engaging each other and the upper and lower heads or flanges of both members respectively lying in the same plane.

Signed at New York and State ot' York in .the county of New New York this 16th day yoit April A. D. 1920.

MAURICE LACHMAN.

Witness IRENE LEFKoWrrz. 

